 /*******************************************************************************
  * Copyright (c) 2004, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.presentations;

 import java.util.Collections ;
 import java.util.List ;

 import org.eclipse.ui.presentations.IPresentablePart;
 import org.eclipse.ui.presentations.IPresentationSerializer;

 /**
  * This class is used to map IPresentableParts onto string IDs
  */
 public class PresentationSerializer implements IPresentationSerializer {

     private List parts = Collections.EMPTY_LIST;

     public PresentationSerializer(List presentableParts) {
         parts = presentableParts;
     }

     /* (non-Javadoc)
      * @see org.eclipse.ui.presentations.IPresentationSerializer#getId(org.eclipse.ui.presentations.IPresentablePart)
      */
     public String getId(IPresentablePart part) {
         int index = parts.indexOf(part);

         return "" + index; //$NON-NLS-1$
 }

     /* (non-Javadoc)
      * @see org.eclipse.ui.presentations.IPresentationSerializer#getPart(java.lang.String)
      */
     public IPresentablePart getPart(String id) {
         try {
             Integer integer = new Integer (id);
             int index = integer.intValue();

             IPresentablePart result = (IPresentablePart) parts.get(index);
             return result;

         } catch (NumberFormatException e) {
         } catch (IndexOutOfBoundsException e) {
         }

         return null;
     }

     /**
      * Prevent this object from being used further. Ensure that none
      * of the methods return anything useful in order to discourage clients
      * from hanging onto references to this object.
      */
     public void dispose() {
         parts = Collections.EMPTY_LIST;
     }

 }

